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For what it's worth, Phil, I have a (homemade) observatory of galvanised iron sitting in an open paddock. The concrete floor is 100mm above ground level and covered with 10mm thick rubber (secondhand conveyor belting), the walls and dome I have insulated with 25mm polystyrene.
We get frequent frosts here with minimums below zero. I have had no problems with condensation, but cover the 'scope (8" Newt) and mounting with a light plastic motorcycle cover just to be sure.
Cheers
Kevin
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